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Definition of Pka

Pka Definition from Science & Technology Dictionaries & Glossaries
General Chemistry Glossary
(pKa) Compare with acid dissociation constant .The pKa of an acid is minus the base-10 log of its acid dissociation constant , pKa = - log Ka. For example, a pKa of 5 is equivalent to an acid dissociation constant of 10-5.
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Pka Definition from Computer & Internet Dictionaries & Glossaries
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Pka Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
PKA, pKa, or other similar variations may stand for:

  • pKa, the symbol for the acid dissociation constant at logarithmic scale
  • Protein kinase A, a class of cAMP-dependent enzymes
  • Pi Kappa Alpha, the North-American social fraternity
  • Public key authentication, establishing key authenticity in public-key cryptography 
  • Professional Karate Association
  • Primary knock-on atom
  • Professionally known as
  • Russian Federal Space Agency 
  • Painkiller Already A podcast hosted by FPSRussia, Woodysgamertag and Murka Durka

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An acid dissociation constant, Ka, (also known as acidity constant, or acid-ionization constant) is a quantitative measure of the strength of an acid in solution. Each acid has a different pKa. It is the equilibrium constant for a chemical reaction known as dissociation in the context of acid-base reactions. The larger the Ka value, the more dissociation of the molecules in solution and thus the stronger the acid. Thus, a strong acid "wants" to get rid of its hydrogen ion, much more so than a weak acid. Not to be confused with pH, which is a measure of how acidic (or basic) a solution is. A small amount of strong acid in water will lead to a low pH (e.g. 2) whereas the same concentration of a weak acid will not lead to such a low pH (e.g. 5).

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Pi Kappa Alpha (ΠΚΑ) is a North American Greek letter college fraternity founded in 1868 at the University of Virginia. The fraternity has over 220 chapters and colonies across the United States and Canada with over 14,000 undergraduate members and 250,000 lifetime initiates. Originally a whites-only Southern organization, the fraternity became a national fraternity in 1909, and removed its racial restrictions in 1964.

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